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SUMMARY Modifications and Alternatives The principal area for which alternatives were considered is that of road relocation. In consideration of the fact that the M&I System plan as described in the FES is authorized and in compliance with'NEPA, this supplement considers alternative modifications assuming that con- struction of the system will proceed as generally described in pages A-I through A-36 of the FES. Road relocations U.S. Highway 189 Potential safety hazards posed by heavy public/construction traffic under the FES plan for U.S. Highway 189 prompted a Reclamation/Utah Department of Transportation (UIlOT) study of alternative realignments, as shown on the map on page S-9. Four alternative alignments were con- sidered. One (southern route A) would be a variation of the FES pre- ferred plan in that it would relocate U.S. Highway 189 along the south side of Jordanelle Reservoir but would eliminate that portion of relo- cated U.S. Highway 189 crossing the dam. One (Browns Canyon alterna- tive) would route Highway 189 along the same alignment as described in the FES but, as with the southern route A alternative, Highway 189 would not croas Jordanelle Dam. Temporary access to the Kamas area would be provided through Browns Canyon, a detour that would be in effect for 2 1/2 years. Another alignment calls for a bridge over the reservoir (alternative route B). With route ll, U.S. Highway 189 would traverse west from Kamas approximately 7 miles to the east side of the reservoir, then bridge the reservoir and extend to the relocated U.S. Highway 40 (described in the FES). Total length of this road, including the bridge section, would be sbout 8.5 miles. With the preferred alternative (northern route C), U.S. Highway 189 would be constructed due west from Kamas through the West Hills for approximately 6 miles, then north- westerly around the north end of the proposed reservoir, tying into the relocated U.S. Highway 40 just south of the Park City Junction. Total length of this road would be about 11.8 miles. After evaluation, the Browns Canyon alternative was eliminated for safety and travel distance considerations, while estimated costs of bridge construction eliminated alternative route B. Conflicting views about the comparative desirability of alternative northern route C ver- sus alternative southern route A were expressed by Summit and Wasatch County residents and officials. The issue was resolved by adopting a proposal to select northern route C as the principal relocation of U.S. Highway 189 and build a new county road to a lesser standard following an alignment similar to southern route A. Additionally, the alignment of relocated U.S. Highway 40 would be extended 0.8 mile southward beyond that described in the FES, and two operation and maintenance roads to the dam would be built. S-7